----- Forwarded by Steve Hanson/UK/IBM on 05/10/2005 17:46 ----- Steve Hanson/UK/IBM To 05/10/2005 17:46 Mike Beckerle/Worcester/IBM cc Geoff Judd/UK/IBM, Suman Kalia/Toronto/IBM@IBMCA Subject Fw: [dfdl-wg] F2F status on discussions here about Scoping #2 I think I see what selectors solve. It's the embedded message scenario where I have a different format, and hence configuration, for the embedded message. I can use selectors to pull together multiple different configurations in a single parse. Correct? Regards, Steve Steve Hanson WebSphere Business Integration Brokers, IBM Hursley, England Internet: smh@uk.ibm.com Phone (+44)/(0) 1962-815848 ----- Forwarded by Steve Hanson/UK/IBM on 05/10/2005 12:27 ----- Steve Hanson/UK/IBM To 05/10/2005 12:18 Mike Beckerle <beckerle@us.ibm.com> cc Geoff Judd/UK/IBM, Suman Kalia/Toronto/IBM@IBMCA Subject Re: [dfdl-wg] F2F status on discussions here about Scoping (Document link: Steve Hanson) Hi, I've taken a look through the slides, looks like you had a productive day. The scheme looks ok in principle, but I can't glean from the foils exactly how the selector mechanism works, and (consequently) why we can't achieve the same result using configuration blocks alone. I'm not trying to be awkward here, just trying to justify to myself why we need the extra complexity selectors introduce. It would be great if we could rubber stamp scoping by the end of the call today. What would be really helpful for the call would be to mail out a single DFDL schema that used configurations and selectors to model the following COBOL message and its equivalent tagged/delimited form. As a comparison, here's a DFDL schema that models this just using configurations. This works because the extends attribute is mandatory on any dfdl element if more than one configuration is defined. 1 MESSAGE 5 STR-FIELD PIC X(10) <----------- logical string length 10 5 INT-FIELD PIC 9(8) COMP <----------- logical integer, physical integer length 4 5 DEC-FIELD PIC 9999V99 DISPLAY <----------- logical decimal, physical extended decimal length 6 with VDP 2 Tagged/delimited example instance using postfix delimiters <MSG><STR>Example;<INT>4000;<DEC>9999.99;<END> <dfdl:configuration name="cobol" repType="binary" ...... /> <dfdl:configuration name="tagged" repType="text" ...... /> <xsd:element name="message"> <xsd:annotation> <xsd:appinfo source="http://dataformat.org"> <dfdl:defaults> <dfdl:configuration extends="cobol" charset="937" byteOrder="bigEndian" /> <dfdl:configuration extends="tagged" charset="850" /> <dfdl:defaults> </xsd:appinfo> </xsd:annotation> <xsd:complexType> <xsd:sequence> <xsd:annotation> <xsd:appinfo source="http://dataformat.org"> <dfdl:sequence extends="tagged" initiator="<MSG>" terminator="<END>" separator=";" separatorType="postfix" /> </xsd:appinfo"> </xsd:annotation> <xsd:element name="str_field" xsd:type="string"> <xsd:annotation> <xsd:appinfo source="http://dataformat.org"> <dfdl:string extends="cobol" baseWidth="10" /> <dfdl:string extends="tagged" initiator="<STR>" /> </xsd:appinfo> </xsd:annotation> </xsd:element> <xsd:element name="int_field" xsd:type="int"> <xsd:annotation> <xsd:appinfo source="http://dataformat.org"> <dfdl:int extends="cobol" baseWidth="4" /> <dfdl:int extends="tagged" initiator="<INT>" /> </xsd:appinfo> </xsd:annotation> </xsd:element> <xsd:element name="string" xsd:type="decimal"> <xsd:annotation> <xsd:appinfo source="http://dataformat.org"> <dfdl:decimal extends="cobol" baseWidth="6" virtualDecimalPoint="2" /> <dfdl:decimal extends="tagged" initiator="<DEC>" virtualDecimalPoint="2" /> </xsd:appinfo> </xsd:annotation> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> Regards, Steve Steve Hanson WebSphere Business Integration Brokers, IBM Hursley, England Internet: smh@uk.ibm.com Phone (+44)/(0) 1962-815848 Mike Beckerle <beckerle@us.ibm. com> To Sent by: dfdl-wg@gridforum.org owner-dfdl-wg@ggf cc .org Subject [dfdl-wg] F2F status on discussions 05/10/2005 03:08 here about Scoping Attached are slides we'll review as a group tomorrow. Could be typos in these. I did them rather fast. [attachment "ggf15-dfdl-wg-f2f-scoping-summary.ppt" deleted by Steve Hanson/UK/IBM]